Train lines between Basingstoke and Andover are blocked due to a tree on the tracks.
As a result, train services running between Salisbury and Basingstoke may be cancelled, delayed or revised.
A message from National Rail said: "South Western Railway have been informed that there is a tree blocking the railway between Basingstoke and Andover.
"Train services cannot currently run towards Salisbury.
"You may be entitled to compensation if you experience a delay in completing your journey today.
"Please keep your train ticket and make a note of your journey, as both will be required to support any claim."
Disruption is expected until 11am.
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